> Building Automation > Vista > TAC Xenta 421A/Xenta 422A Universal Input and Digital Output Module 
TAC Xenta 421A and 422A are Universal Input/Digital Output modules in the TAC Xenta family. They can be used as normal Xenta I/O modules or as certified LonMark® devices. Both modules have four universal inputs and five digital outputs. The universal inputs can be used as digital, thermistor,current, or voltage inputs. In addition, TAC Xenta 422A is equipped with LED status indicators, one for each digital input, and manual override switches for the digital outputs. The LED colors, red or green, can be selected individually by altering the parameter settings in TAC Menta® graphical tool or manually at start up.
